模压变形法的研究现状

Study Status of CGP & GP

模压变形法(CGP&GP)是新近开发的一种剧烈塑性变形方法,可在保持试样外形尺寸不变的情况下制备超细晶板材。其基本工艺原理是将试样放入齿形周期变化的模具中,在压力的作用下,对试样进行反复的变形,从而使得有效应变得到累积,最终使材料晶粒得到细化。详细介绍了CGP&GP的工艺原理,变形道次、模压温度和模具齿宽等影响因素对试样材料组织和力学性能的影响规律。

Constrained groove pressing （CGP） and groove pressing （GP） are newly developed severe plastic deformation techniques for fabrication of plate-shaped metallic materials without changing their initial dimensions. Their basic principle is that samples are put into the molds with cycle variational teeth. The samples are subjected to repetitive deformation under the pressure function, so that the effective strain is cumulated and the grains of the samples are refined finally. The basic principle of CGP ＆ GP and the influence of processing technology on the microstructure and mechanical properties are introduced.